Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Contact Us
Online Help
Domain Status
Man Pages

Virtual Servers

Topology Map

Server Agreement
Year 2038

USA Flag



Man Pages

Manual Reference Pages  -  FLIPDIFF (1)

.ds Aq ’


flipdiff - exchange the order of two incremental patches



flipdiff [[-p n] | [--strip-match=n]] [[-U n] | [--unified=n]] [[-d PAT] | [--drop-context=PAT]] [[-q] | [--quiet]] [[-z] | [--decompress]] [[-b] | [--ignore-space-change]] [[-B] | [--ignore-blank-lines]] [[-i] | [--ignore-case]] [[-w] | [--ignore-all-space]] [--in-place] diff1 diff2
flipdiff {[--help] | [--version]}


flipdiff exchanges the order of two patch files that apply one after the other. The patches must be \(lqclean\(rq: the context lines must match and there should be no mis-matched offsets.

The swapped patches are sent to standard output, with a marker line (\(lq=== 8< === cut here === 8< ===\(rq) between them, unless the --in-place option is passed. In that case, the output is written back to the original input files.


-p n, --strip-match=n

When comparing filenames, ignore the first n pathname components from both patches. (This is similar to the -p option to GNU patch(1).)

-q, --quiet

Quieter output. Dont emit rationale lines at the beginning of each patch.

-U n, --unified=n

Attempt to display n lines of context (requires at least n lines of context in both input files). (This is similar to the -U option to GNU diff(1).)

-d pattern, --drop-context=PATTERN

Dont display any context on files that match the shell wildcard pattern. This option can be given multiple times.

Note that the interpretation of the shell wildcard pattern does not count slash characters or periods as special (in other words, no flags are given to fnmatch). This is so that \(lq*/basename\(rq-type patterns can be given without limiting the number of pathname components.

-i, --ignore-case

Consider upper- and lower-case to be the same.

-w, --ignore-all-space

Ignore whitespace changes in patches.

-b, --ignore-space-change

Ignore changes in the amount of whitespace.

-B, --ignore-blank-lines

Ignore changes whose lines are all blank.

-z, --decompress

Decompress files with extensions .gz and .bz2.


Write output to the original input files.


Display a short usage message.


Display the version number of flipdiff.


This is only been very lightly tested, and may not even work. Using --in-place is not recommended at the moment.

There are some cases in which it is not possible to meaningfully flip patches without understanding the semantics of the content. This program only uses complete lines that appear at some stage during the application of the two patches, and never composes a line from parts.

Because of this, it is generally a good idea to read through the output to check that it makes sense.


Tim Waugh <>

Package maintainer
Search for    or go to Top of page |  Section 1 |  Main Index

patchutils FLIPDIFF (1) 23 January 2009

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.